I have PCO too. The only time I cycled with one follicle (instead of a plethora of cysts), I had sworn off sugar for the whole month. I was really stunned at that result, but pleased as punch! As that month, the transfer worked.

As for improving egg quality, I'm certain that cutting sugar will have a great impact. Combine with low GI/low carb diet (chocolate may be officially 'low GI', but is still full of sugar), and healthy exercise - well... you're setting yourself up right.

Fingers crossed ladies. Let us know how you get on.